docs: def random_subsets(self, relative_sizes, by_duration=False, balance_labels=False, label_list_ids=None):
          """
          Create a bunch of subsets with the given sizes relative to the size or duration of the full corpus.
          Basically the same as calling ``random_subset`` or ``random_subset_by_duration`` multiple times
          with different values. But this method makes sure that every subset contains only utterances,
          that are also contained in the next bigger subset.
  
          Args:
              relative_sizes (list): A list of numbers between 0 and 1 indicating the sizes of the desired subsets,
                                     relative to the full corpus.
              by_duration (bool): If True the size measure is the duration of all utterances in a subset/corpus.
              balance_labels (bool): If True the labels contained in a subset are chosen to be balanced
                                     as far as possible.
              label_list_ids (list): List of label-list ids. If none is given, all label-lists are considered
                                     for balancing. Otherwise only the ones that are in the list are considered.
  
          Returns:
              dict : A dictionary containing all subsets with the relative size as key.
          """
          resulting_sets = {}
          next_bigger_subset = self.corpus
  
          for relative_size in reversed(relative_sizes):
              generator = SubsetGenerator(next_bigger_subset, random_seed=self.random_seed)
  
              if by_duration:
                  sv = generator.random_subset_by_duration(relative_size, balance_labels=balance_labels,
                                                           label_list_ids=label_list_ids)
              else:
                  sv = generator.random_subset(relative_size, balance_labels=balance_labels,
                                               label_list_ids=label_list_ids)
  
              resulting_sets[relative_size] = sv
  
          return resulting_sets